[英]How to send a key to a process
I have started a process and want to post a message like PageDown key to it. 我已经开始一个过程,并想向其发布诸如PageDown键之类的消息。
Here is the code for running the process. 这是用于运行该过程的代码。
Process.Start("chrome.exe", "D:/sample.htm");
foreach (System.Diagnostics.Process p in System.Diagnostics.Process.GetProcesses())
{
if (p.ProcessName == "chrome" && p.MainWindowTitle == "sample.htm - Google Chrome")
{
//how to Send a pagedown key to process p
}
}
I created following class but i don't know why it doesn't work? 我创建了以下课程,但我不知道为什么它不起作用?
class KeyHandle
{
private static Int32 WM_KEYDOWN = 0x100;
private static Int32 WM_KEYUP = 0x101;
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", SetLastError = true)]
static extern bool PostMessage(IntPtr hWnd, int Msg, System.Windows.Forms.Keys wParam, int lParam);
public static void SendKey(IntPtr hWnd, System.Windows.Forms.Keys key)
{
PostMessage(hWnd, WM_KEYUP, key, 0);
}
}
and call it this way 并这样称呼它
foreach (System.Diagnostics.Process p in System.Diagnostics.Process.GetProcesses())
{
if (p.ProcessName == "chrome" && p.MainWindowTitle == "sample.htm - Google Chrome")
{
KeyHandle.SendKey(p.MainWindowHandle, Keys.PageDown);
}
}
I rewrite your code using SendKeys API. 我使用SendKeys API重写您的代码。 I test it it works well
我测试它运作良好
foreach (System.Diagnostics.Process p in System.Diagnostics.Process.GetProcesses())
{
if (p.ProcessName == "chrome" && p.MainWindowTitle == "sample.htm - Google Chrome" &&
p.MainWindowHandle != IntPtr.Zero)
{
SetForegroundWindow(p.MainWindowHandle);
SendKeys.SendWait("{PGDN}");
}
}
To declare the function SetForegroundWindow, use : 要声明函数SetForegroundWindow,请使用:
[DllImport("user32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
Process.Start("chrome.exe", "D:/sample.htm"); Process.Start(“ chrome.exe”,“ D:/sample.htm”); foreach (System.Diagnostics.Process p in System.Diagnostics.Process.GetProcesses()) { if (p.ProcessName == "chrome" && p.MainWindowTitle == "sample.htm - Google Chrome") { KeyHandle.SendKey(p.MainWindowHandle, Keys.PageDown);
foreach(System.Diagnostics.Process.GetProcesses()中的System.Diagnostics.Process p){如果(p.ProcessName ==“ chrome” && p.MainWindowTitle ==“ sample.htm-Google Chrome”){ p.MainWindowHandle,Keys.PageDown); } } You require this class as well
您也需要此类
class KeyHandle { private static Int32 WM_KEYDOWN = 0x100; class KeyHandle {private static Int32 WM_KEYDOWN = 0x100; private static Int32 WM_KEYUP = 0x101;
私有静态Int32 WM_KEYUP = 0x101;
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", SetLastError = true)]
static extern bool PostMessage(IntPtr hWnd, int Msg, System.Windows.Forms.Keys wParam, int lParam);
public static void SendKey(IntPtr hWnd, System.Windows.Forms.Keys key)
{
PostMessage(hWnd, WM_KEYUP, key, 0);
}
} }
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